src/modules/m_spanningtree/treesocket1.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "commands/cmd_whois.h"
  16 #include "commands/cmd_stats.h"
  17 #include "socket.h"
  18 #include "xline.h"
  19 #include "../transport.h"
  20 #include "../m_hash.h"
  21 #include "socketengine.h"
  22
  23 #include "main.h"
  24 #include "utils.h"
  25 #include "treeserver.h"
  26 #include "link.h"
  27 #include "treesocket.h"
  28 #include "resolvers.h"
  29 #include "handshaketimer.h"
  30
  31 /* $ModDep: m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h m_hash.h m_spanningtree/handshaketimer.h */
  32
  33
  34 /** Because most of the I/O gubbins are encapsulated within
  35  * BufferedSocket, we just call the superclass constructor for
  36  * most of the action, and append a few of our own values
  37  * to it.
  38  */
  39 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string shost, int iport, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Module* HookMod)
  40         : BufferedSocket(SI, shost, iport, maxtime, bindto), Utils(Util), Hook(HookMod)
  41 {
  42         age = SI->Time();
  43         myhost = ServerName;
  44         theirchallenge.clear();
  45         ourchallenge.clear();
  46         this->LinkState = CONNECTING;
  47         Utils->timeoutlist[this] = std::pair<std::string, int>(ServerName, maxtime);
  48         if (Hook)
  49                 BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
  50         hstimer = NULL;
  51 }
  52
  53 /** When a listening socket gives us a new file descriptor,
  54  * we must associate it with a socket without creating a new
  55  * connection. This constructor is used for this purpose.
  56  */
  57 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, int newfd, char* ip, Module* HookMod)
  58         : BufferedSocket(SI, newfd, ip), Utils(Util), Hook(HookMod)
  59 {
  60         age = SI->Time();
  61         this->LinkState = WAIT_AUTH_1;
  62         theirchallenge.clear();
  63         ourchallenge.clear();
  64         sentcapab = false;
  65         /* If we have a transport module hooked to the parent, hook the same module to this
  66          * socket, and set a timer waiting for handshake before we send CAPAB etc.
  67          */
  68         if (Hook)
  69                 BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
  70
  71         hstimer = new HandshakeTimer(ServerInstance, this, &(Utils->LinkBlocks[0]), this->Utils, 1);
  72         ServerInstance->Timers->AddTimer(hstimer);
  73
  74         /* Fix by Brain - inbound sockets need a timeout, too. 30 secs should be pleanty */
  75         Utils->timeoutlist[this] = std::pair<std::string, int>("<unknown>", 30);
  76 }
  77
  78 ServerState TreeSocket::GetLinkState()
  79 {
  80         return this->LinkState;
  81 }
  82
  83 Module* TreeSocket::GetHook()
  84 {
  85         return this->Hook;
  86 }
  87
  88 void TreeSocket::CleanNegotiationInfo()
  89 {
  90         ModuleList.clear();
  91         CapKeys.clear();
  92         ourchallenge.clear();
  93         theirchallenge.clear();
  94         OutboundPass.clear();
  95 }
  96
  97 TreeSocket::~TreeSocket()
  98 {
  99         if (Hook)
 100                 BufferedSocketUnhookRequest(this, (Module*)Utils->Creator, Hook).Send();
 101         if (hstimer)
 102                 ServerInstance->Timers->DelTimer(hstimer);
 103         Utils->timeoutlist.erase(this);
 104 }
 105
 106 /** When an outbound connection finishes connecting, we receive
 107  * this event, and must send our SERVER string to the other
 108  * side. If the other side is happy, as outlined in the server
 109  * to server docs on the inspircd.org site, the other side
 110  * will then send back its own server string.
 111  */
 112 bool TreeSocket::OnConnected()
 113 {
 114         if (this->LinkState == CONNECTING)
 115         {
 116                 /* we do not need to change state here. */
 117                 for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 118                 {
 119                         if (x->Name == this->myhost)
 120                         {
 121                                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2[%s] started.", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->GetIP().c_str()));
 122                                 if (Hook)
 123                                 {
 124                                         BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
 125                                         ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2[%s] using transport \2%s\2", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->GetIP().c_str()),
 126                                                         x->Hook.c_str());
 127                                 }
 128                                 this->OutboundPass = x->SendPass;
 129                                 sentcapab = false;
 130
 131                                 /* found who we're supposed to be connecting to, send the neccessary gubbins. */
 132                                 if (this->GetHook())
 133                                 {
 134                                         hstimer = new HandshakeTimer(ServerInstance, this, &(*x), this->Utils, 1);
 135                                         ServerInstance->Timers->AddTimer(hstimer);
 136                                 }
 137                                 else
 138                                         this->SendCapabilities();
 139
 140                                 return true;
 141                         }
 142                 }
 143         }
 144         /* There is a (remote) chance that between the /CONNECT and the connection
 145          * being accepted, some muppet has removed the <link> block and rehashed.
 146          * If that happens the connection hangs here until it's closed. Unlikely
 147          * and rather harmless.
 148          */
 149         ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2 lost link tag(!)", myhost.c_str());
 150         return true;
 151 }
 152
 153 void TreeSocket::OnError(BufferedSocketError e)
 154 {
 155         Link* MyLink;
 156
 157         switch (e)
 158         {
 159                 case I_ERR_CONNECT:
 160                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Connection to \002%s\002 refused", myhost.c_str());
 161                         MyLink = Utils->FindLink(myhost);
 162                         if (MyLink)
 163                                 Utils->DoFailOver(MyLink);
 164                 break;
 165                 case I_ERR_SOCKET:
 166                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Could not create socket (%s)", strerror(errno));
 167                 break;
 168                 case I_ERR_BIND:
 169                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Error binding socket to address or port (%s)", strerror(errno));
 170                 break;
 171                 case I_ERR_WRITE:
 172                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: I/O error on connection (%s)", errno ? strerror(errno) : "Connection closed unexpectedly");
 173                 break;
 174                 case I_ERR_NOMOREFDS:
 175                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Operating system is out of file descriptors!");
 176                 break;
 177                 default:
 178                         if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN))
 179                                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to \002%s\002 failed with OS error: %s", myhost.c_str(), strerror(errno));
 180                 break;
 181         }
 182 }
 183
 184 int TreeSocket::OnDisconnect()
 185 {
 186         /* For the same reason as above, we don't
 187          * handle OnDisconnect()
 188          */
 189         return true;
 190 }
 191
 192 void TreeSocket::SendError(const std::string &errormessage)
 193 {
 194         /* Display the error locally as well as sending it remotely */
 195         ServerInstance->SNO->WriteToSnoMask('l', "Sent \2ERROR\2 to %s: %s", (this->InboundServerName.empty() ? this->GetIP().c_str() : this->InboundServerName.c_str()), errormessage.c_str());
 196         this->WriteLine("ERROR :"+errormessage);
 197         /* One last attempt to make sure the error reaches its target */
 198         this->FlushWriteBuffer();
 199 }
 200
 201 /** This function forces this server to quit, removing this server
 202  * and any users on it (and servers and users below that, etc etc).
 203  * It's very slow and pretty clunky, but luckily unless your network
 204  * is having a REAL bad hair day, this function shouldnt be called
 205  * too many times a month ;-)
 206  */
 207 void TreeSocket::SquitServer(std::string &from, TreeServer* Current)
 208 {
 209         /* recursively squit the servers attached to 'Current'.
 210          * We're going backwards so we don't remove users
 211          * while we still need them ;)
 212          */
 213         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 214         {
 215                 TreeServer* recursive_server = Current->GetChild(q);
 216                 this->SquitServer(from,recursive_server);
 217         }
 218         /* Now we've whacked the kids, whack self */
 219         num_lost_servers++;
 220         num_lost_users += Current->QuitUsers(from);
 221 }
 222
 223 /** This is a wrapper function for SquitServer above, which
 224  * does some validation first and passes on the SQUIT to all
 225  * other remaining servers.
 226  */
 227 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 228 {
 229         bool LocalSquit = false;
 230
 231         if ((Current) && (Current != Utils->TreeRoot))
 232         {
 233                 Event rmode((char*)Current->GetName().c_str(), (Module*)Utils->Creator, "lost_server");
 234                 rmode.Send(ServerInstance);
 235
 236                 parameterlist params;
 237                 params.push_back(Current->GetName());
 238                 params.push_back(":"+reason);
 239                 Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
 240                 if (Current->GetParent() == Utils->TreeRoot)
 241                 {
 242                         this->ServerInstance->SNO->WriteToSnoMask('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
 243                         LocalSquit = true;
 244                 }
 245                 else
 246                 {
 247                         this->ServerInstance->SNO->WriteToSnoMask('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
 248                 }
 249                 num_lost_servers = 0;
 250                 num_lost_users = 0;
 251                 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
 252                 SquitServer(from, Current);
 253                 Current->Tidy();
 254                 Current->GetParent()->DelChild(Current);
 255                 delete Current;
 256                 if (LocalSquit)
 257                         this->ServerInstance->SNO->WriteToSnoMask('l', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
 258                 else
 259                         this->ServerInstance->SNO->WriteToSnoMask('L', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
 260         }
 261         else
 262                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server");
 263 }
 264
 265 /** This function is called when we receive data from a remote
 266  * server. We buffer the data in a std::string (it doesnt stay
 267  * there for long), reading using BufferedSocket::Read() which can
 268  * read up to 16 kilobytes in one operation.
 269  *
 270  * IF THIS FUNCTION RETURNS FALSE, THE CORE CLOSES AND DELETES
 271  * THE SOCKET OBJECT FOR US.
 272  */
 273 bool TreeSocket::OnDataReady()
 274 {
 275         const char* data = this->Read();
 276         /* Check that the data read is a valid pointer and it has some content */
 277         if (data && *data)
 278         {
 279                 this->in_buffer.append(data);
 280                 Utils->Creator->loopCall = true;
 281                 /* While there is at least one new line in the buffer,
 282                  * do something useful (we hope!) with it.
 283                  */
 284                 while (in_buffer.find("\n") != std::string::npos)
 285                 {
 286                         std::string ret = in_buffer.substr(0,in_buffer.find("\n")-1);
 287                         in_buffer = in_buffer.substr(in_buffer.find("\n")+1,in_buffer.length()-in_buffer.find("\n"));
 288                         /* Use rfind here not find, as theres more
 289                          * chance of the \r being near the end of the
 290                          * string, not the start.
 291                          */
 292                         if (ret.find("\r") != std::string::npos)
 293                                 ret = in_buffer.substr(0,in_buffer.find("\r")-1);
 294                         /* Process this one, abort if it
 295                          * didnt return true.
 296                          */
 297                         if (!this->ProcessLine(ret))
 298                         {
 299                                 return false;
 300                         }
 301                 }
 302                 Utils->Creator->loopCall = false;
 303                 return true;
 304         }
 305         /* EAGAIN returns an empty but non-NULL string, so this
 306          * evaluates to TRUE for EAGAIN but to FALSE for EOF.
 307          */
 308         return (data && !*data);
 309 }